Pen



FIG. 1 is an upper front right perspective view of a pen showing my newdesign;

FIG. 2 is a front elevation view thereof, with the rear, right side, andleft side elevation views being a mirror image of the front elevationview;

FIG. 3 is an enlarged top plan view thereof; and,

FIG. 4 is an enlarged bottom plan view thereof.

The broken lines shown in FIGS. 1 and 3 illustrate environmental subjectmatter and form no part of the claimed design.

The ornamental design for a pen, as shown and described.